William was born about 1666, the son of unknown parents. The place is not known.
He died on 24 DEC 1719. The place is not known.
His wife was Mary Villiers, who he married in APR 1691. The place has not been found. They had no known children.
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | ABT 1666 |
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| Death | 24 DEC 1719 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | earl of Inchiquin |
Note 1
son of William O'Brien, 2nd Earl of Inchiquin and Lady Margaret Boyle.